The spongy (penile) urethra is the longest part of the male urethra, about 15 cm, running through the corpus spongiosum from the bulb to the tip of the glans. It widens in the bulb and again in the glans as the navicular fossa, then ends at the slit-like external urethral opening. The ducts of the bulbourethral glands and many small urethral glands open into it.
| Location | Within the corpus spongiosum of the penis, from the perineal membrane to the external urethral orifice |
|---|---|
| Parts |
|
| Nerve Supply | Dorsal nerve of the penis (pudendal nerve); Cavernous nerves |
| Blood Supply | Artery of the bulb of the penis; Urethral artery; Dorsal artery of the penis |
| Venous drainage |
|
| Lymphatic drainage |
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Carries urine and semen through the penis to the outside.
The bulbar part is injured by straddle falls, which can leak blood and urine into the perineum under Colles fascia, producing a characteristic butterfly bruise. Most male urethral strictures occur here. In hypospadias the urethral opening lies on the underside of the penis rather than at the tip.
A crush of the bulbar urethra against the pubis from a straddle injury, with perineal bruising and urine leakage.
A congenital condition in which the urethral opening is on the underside of the penis, often with downward curvature.
Scarring of the bulbar urethra causing a slow stream and straining.
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